As with the other cults in this section we don't have to look far to find a recovery site:
"Exit and Support Network
Aiding those spiritually abused by Worldwide Church of God, Philadelphia Church of God, and all offshoots."
http://www.exitsupportnetwork.com/index.htm
As exposed in the sidebar articles in that recovery site Armstrong would seem to have been a real piece of work.
http://www.exitsupportnetwork.com/mike_ep/exam/exam.htm
https://en.wikipedia.org/wiki/Grace_Communion_International
British Israelism
https://en.wikipedia.org/wiki/Grace_Communion_International#Historical_teachings_under_Armstrong